As widely reported elsewhere, data.gov.uk is now available in public beta:

Data.gov.uk acts as an online point of access for government-held non-personal data. This is to enable people like you to take it, re-use it and make interesting things with.

Full introductory post at this link…

“It’s [government data] such an untapped resource,” Sir Tim Berners Lee told BBC News.

“Government data is something we have already spent the money on… and when it is sitting there on a disk in somebody’s office it is wasted.”